Apparatus for heating or cooling liquids.



A. JENSEN.

APPARATUS FOR HEATING 0R COOLING LIQUIDS.

APPLICATION FILED MAY 8, 1909.

Patented Feb. 22, 1910.

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AAGE JENSEN, OF EUREKA, CALIFORNIA.

, APPARATUS FOR HEATING OB COOLING LIQUIDS.

9&9, 769.

Specification of Letters Patent.

Patented Feb. 22, 1910.

Application filed may 8; 1909. Serial No. 494,895.

To all whom it may concern:

Be it known that I, AAGE JENSEN, a citizen of the United States, residing at Eureka, in the county of Humboldt and State of California, have invented new and useful Imprm'ements in Apparatus for Heating or Cooling Liquids, of which the following is a specification.

ing h ne sire in construction and which will produce a substantially uniform heating or cooling i eiiect at the different levels of the receptacle The object of the present invention is to provide an apparatus for heating or cooling liquids, whic1 shall be simple and inexpenfor. containing the said liquid.

In the accompanying drawing,-Figure 1 is a vertical section of my improved apparatus, certain parts being shown in side elevation;

Fig. 2 is an enlarged vertical section of the upper portion of the apparatus; Fig. 3 is a vertical section through the connection box, at right angles to that shown in F ig. 2;

Fig. 4 is a horizontal section throu h said box and through the ends of the co' Referring to the drawing, 1 indicates a suitable receptacle for milk, cream, or other liquidto be treated, which may be either cy; lindrical in form, where only a single heating or cooling appliance is used, or, elongated, when there are used a number of such appliances, preferably in line with each other. Said receptacle has a suitable metallic lining 2 and stands upon legs 3. It is closed by a cover 4, in. the center of which is secured a vertical tubular guide 5, upon the upper edge of. which is a runway 6 for balls 7, upon which rotates a sleeve 8 secured to a tube 9 extending downward through said guide 5. Said sleeve is formed with a bevel gear 10 which meshes with a bevel gear 11 on a horizontal shaft 12 supported 5 in a bearlng 13 upon the cover 4 ofthe; receptacle and drivenby a pulley 14: from any suitable source of. power, thereby imparting rotation to the bevel gear 10 and to the tube 9.

Secured upon the bearing 13 forthe horizontal shaft is an upperbearing 15 for the tube 9, said bearing being formed with a channel 16 with which connects an outlet pipe 17, said bearing being provided with stuffboxes 18, 19, above and below said chan- 16. Said outlet pipe 17 communicates with the tube 9 through holes 20 formed in the latter opposite to the channel 16.

v The lower end of the tube 9v is screwed i form of an elbow 46, formed integral with i said box 21, having a horizontal threaded i aperture 24 and a vertical threaded aperture, 25. The c lindrical wall of the box, 21 is also forme with a threaded aperture opposite to the aperture 24, and, by means of said threaded apertures, having right and left threads respectively, the box is adapted to g be screwed on to the ends of a tube 26. Said tube is in the form of a double helix, extending from one end downward in a heli- 5 cal coil and then from the bottom extending in a helical coil upward to the other end, the second helical coil alternatin with or intermediate between the first coil. After X said coil, so that said ends are connected with the respective compartments 22, 23, of the box, the box with the coil attached thereto is then screwed on to the lower end of th tube 9. y

? 27 indicates the inlet pipe, with which connect a pipe 28 for admitting cold Water. a pipe 29 for admitting brine, and a pipe 30 for admitting steam. One or more of of cooling or heating. The pipe 27 makes a tight connection with the upper end of the tube 9 by means of a stuffing box 31. W'ithin said tube 9 a smaller tube 32, open a at each end, extends from a point above the 5 outlet pipe 17 to the connection box,. the lower end of said pipe being screwed 1ntov the threaded aperture 25 inthe elbow- 4.6-

Of the pipe 32 is separated from the space the steam inlet.

to the interior of the receptacle through which is closed by a valve 40 having a stem 41- which can be raised by a lever 42.

' The operation of the apparatus is as folthese can be used selectively for the purpose between said inner and outer tubes 9 and '32- by ahead 33. Thus the inletv pipe 27 com-- flow 38 at a'higher pointthan the level of- The liquid to be treated can be suppliedsaid box has been, screwed upon the ends of" l in said connectlon box 21. The upper end.

suitable doors 43 in the cover, and can be drawn .off from the receptacle by a pipe 39 lows: The liquid to be treated having been .supplied to the casing, and power having been supplied to the shaft 12, the inner and outer tubes and the double helical coil connected thereto are thereby set in rotation, a very small amount of power being needed therefor on account of the whole weight being suspended upon the ball bearings 7. Supposing, now, that it be desired to heat said liquid, and the inner, outer, and helical tubes being, filled with water, steam is admitted by the inletp ipe 27, which causes the water to flow, as shown by the arrows, down the inner tube 32, into the chamber 23 of the connecting box 21, thence down one-half of the helical tube 26, then up the other half of the same, thence into the chamber 22 in the connecting box 21, thence into the space between the inner and outer tubes 32, 9,, and to the upperportion of the outer tube 9, thence through the openings 20 at the top of said outer tubeinto the channel 16, thence to the outlet pipe 17, thence by the connecting pipe "through the check valve 36 to the inlet pipe 27,- thus flowin in,a continuous circuit. Any excess 0 water condensed fromthe steam will flow off by the overflow pipe. The heated coil thus revolving within the receptacle heats the liquid therein, and owing to the fact that'the pressure on the central tube due to theweight" a of the vertical and helical tubes and to the there is no tendency whatever to deflect the same from the vertical.

A novel feature of this invention consists in the use of the double helical coil both the inlet and'outletends of which are at the top of the coil. In prior apparatus of this character, in which there is used a coil or coils having a verticalaxis, the outlet end of said coil is at the opposite end of the receptacle, vertically to .its inlet end, one of these ends having been connected to 'a straight tube through the center of the coil. Since this straight tube produces practically no heating orcooling effect, and since, in pasteurizing, for instance, the coil gives off its heat continually from the inlet to the outlet end, so that, while the inlet end of the .coil is very hot, its outlet end is substantially of the same temperature as the liquid to be treated, and the heating or pasteurizing effect upon the liquid is very unequal, the liquid being unduly heated at the inlet end while at the outlet end it is not sufliciently heated. This "defect in the operation of the apparatus is not entirely remedied by the that it is undesirable to .heat certain liquids,

such as milk or cream, above the temperature, necessary for pasteurization, for to do so changes the character of the milk or cream. But if the heating liquid at the outlet end of the' coil is brought to substantially the sametemperature as the liquid to be treated its temperature at the inlet end must be very much higher than the pasteurizing temperature in order to produce an average temperature proper for pasteurization. This excessive heat at the inlet end of the coil, being for acomparatively long time transmitted to the adjacent liquid to be treated. tends to injuriously affect the character of saidli uid. In the present improvement. this ObJGCtlOIl is avoided, b reason of the faet that the inlet and out et ends of the coil are at the same level, and consequently, in the rotation of the coil, an excessive heat ing effect by the inlet end of the coil is neutralized by the much lower temperature at the outlet end thereof. In fact, it will readily be seen that the heating effect of the coil .is substantially uniform fdr all heights of the coil. The result is a great increase in rapidity of operation, certainty of pasteurization, and uniformity in the character of the milk or cream so treated.

I claim I In an apparatus of the character described, the combination, with a suitable receptacle having an aperture, ofmeans for changing the temperature of a liquid in said receptacle, comprising supply and discharge pipes, one within the other, passing through,

and rotatable in, said aperture, a tube in means for rotating said pipes and tube about the central axis of said plpes, substantially as described.

' In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

. AAGE JENSEN. Witnesses I FRANK NAZRO, J. NISSON. 

